ICP_Operations_Guide_2016

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Some of these questions may appear as if they belong in other sections but they all impact the availability of the standard in important ways. For example, blends that must be kept refrigerated or frozen cannot be used until allowed to come to room temperature. This is often the case with blends manufactured within the biological pH range of 4-10. Documentation Although documentation may seem less important than the above topics, it is paramount for less obvious reasons. Think about the following questions:

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ISO has issued a document referred to as ISO Guide 31. This document details what the international scientific community considers to be critical to the analyst when using chemical standard solutions or CRMs. Our guide to Certificate of Analysis Components* offers explanations of each section of an ISO Guide 31-compliant Certificate of Analysis. Traceability *T JU QPTTJCMF UIBU UIF TDJFOUJĕD DPNNFSDJBM PS MFHBM DPNNVOJUJFT XJMM TDSVUJOJ[F ZPVS EBUB *G TP UIF JTTVF PG USBDFBCJMJUZ NBZ be more critical than you realize. Traceability has been defined as “the property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties.” This definition has achieved global acceptance in the metrology community. Refer to our article NIST Traceability* for additional information. Calculations, Handling, Preparation and Storage of Standards 3 Handling Observing the following recommendations will save considerable time, money, and frustration: 1. Never put solution transfer devices into the standard solution. This precaution avoids possible contamination from the pipette or transfer device. 2. Always pour an aliquot from the standard solution to a suitable container for the purpose of volumetric pipette solution transfer and do not add the aliquot removed back to the original standard solution container. This precaution is intended to

* Visit inorganicventures.com/tech/icp-operations/ for additional information from this link